Helmet



FIG. 1 is a side view of a helmet showing my new design with a movable part in a first position;

FIG. 2 is a similar side view thereof, showing the movable part in a second position;

FIG.3 is a front view thereof with the movable part in the first postion;

FIG. 4 is a front view thereof with the movable part in the second position;

FIG. 5 is a rear view thereof with the movable part in the first position; and,

FIG. 6 is a rear view thereof, with the movable part in the second position.

Portions of the helmet as seen from the top in plan not shown in the photographs or described in the specification form no part of the claimed design.

The interior details of the room shown on the eye shield in FIGS. 3 and 4 form no part of the claimed design. 

The ornamental design for a helmet, as shown and described. 